High vacuum pump

Abstract

A high vacuum pump having a centrifugally filtered intake with a particular utility as an aspirator in a dentist's office, for example, having a coaxial intake/output at the pump's rotor hub with a radial outlet therefrom, a liquid pressure seal on the top and bottom of the pump impeller assembly and an automatically flushed sump tank surrounding the intake filter.

The invention claimed is: 
     
       1. A high vacuum pump comprising: a generally cylindrical housing having a housing inlet and a housing outlet,   an impeller assembly having a rotor hub in the center thereof rotatably mounted eccentrically of the axis of said housing, said hub defining a passageway extending the length thereof and forming an intake at one axial end thereof;   an outlet at the other axial end of said hub, said outlet communicating via an inlet chamber in said housing with impeller blades in said impeller assembly on one radial side thereof; and   an exhaust duct on the other radial side of said impeller assembly extending radially from the axis of said rotor hub.   
     
     
       2. The high vacuum pump of claim 1, wherein said impeller assembly is at a generally cylindrical configuration having opposite generally circular end surfaces, first and second water seals between the housing and the circular surfaces, respectively, of said impeller assembly.   
     
     
       3. The high vacuum pump assembly of claim 1, wherein: said housing outlet communicates with said impeller radially from the outer diameter thereof closely adjacent the axis thereof.   
     
     
       4. The high vacuum pump of claim 1 and further including: centrifically filtered intake means at said hub inlet.   
     
     
       5. The high vacuum pump of claim 4 and further including: a sump tank surrounding said centrifically filtered intake means.   
     
     
       6. The high vacuum pump of claim 4 and further including: automatic flushing means coupled to said sump tank.   
     
     
       7. The high vacuum pump of claim 4, wherein: said filter comprises a cylindrical filter element mounted on the end of and extending co-axially of said hub, and   an open ended cone surrounding said filter element.